Prince William turns 35

Prince William Spends Time With Queen Elizabeth II

Prince William, Duke of Cambridge gives Queen Elizabeth II a tour as they open the new East Anglian Air Ambulance Base at Cambridge Airport on July 13, 2016 in Cambridge, England.

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Prince William watches Nao the robot dance at the London 2016 Founders Forum in Watford, Hertfordshire, England, June 16, 2016. The conference and networking event is for the leading digital and technology entrepreneurs from the United Kingdom and around the world.

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Britain's Kate Duchess of Cambridge signs a book of condolence for the Orlando nightclub shooting victims at the US Embassy in London, while Prince William looks on, June 14, 2016.

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Britain's Prince Harry, Catherine, The Duchess of Cambridge and her husband, Prince William leave St. Paul's Cathedral in London June 10, 2016, after attending the National Service of Thanksgiving to mark the 90th birthday of Queen Elizabeth II.

EPA

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive to greet guests attending a garden party at Buckingham Palace, May 24, 2016, in London.

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Britain's Catherine, Duchess of Cambridge holds her daughter Princess Charlotte, Prince George, Britain's Prince William, Duke of Cambridge, Britain's Prince Harry and Britain's Queen Elizabeth II stand on the balcony of Buckingham Palace to watch a fly-past of aircrafts by the Royal Air Force, in London, June 11, 2016.

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Prince William and Catherine, Duke and Duchess of Cambridge, and Prince Harry attend the launch of their Heads Together campaign to eliminate stigma on mental health at the Queen Elizabeth Olympic Park in London.

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Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, arrive in an open carriage to attend Day 2 of Royal Ascot on June 15, 2016 in Ascot, England.

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A picture made available on March 7, 2016 shows Catherine, Duchess of Cambridge, Princess Charlotte, Prince George and Prince William, Duke of Cambridge posing for pictures as they enjoy a short private break skiing in the French Alps.

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A picture made available March 7, 2016 shows Prince William, right,Duke of Cambridge cuddling his daughter Princess Charlotte of Cambridge as he and his family enjoy a short private break skiing in the French Alps, France, March 3, 2016.

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This image released April 20, 2016 shows four generations of the Royal family, from left, Prince Charles, Queen Elizabeth II, Prince George and Prince William, the Duke of Cambridge, during a photo shoot for the Royal Mail in the summer of 2015 in the White Drawing Room at Buckingham Palace in London for a stamp sheet to mark the 90th birthday of Britain's Queen Elizabeth II.

Ranald Mackechnie/Royal Mail via AP Photo

Prince Williams Plays Soccer in a Suit

Prince William, Duke of Cambridge, takes a penalty kick during a visit to The Football for Peace initiative at Saltley Academy on Dec. 7, 2015 in Birmingham, England.

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Prince William Supports a Campaign for His Mother

Prince William, Duke Of Cambridge takes part in a group exercise during his visit to Hammersmith Academy to support the Diana Award's Anti-bullying Campaign, Sept. 21, 2015, in London.

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Britain's Prince William, the Duke of Cambridge walks, with an East Anglian Air Ambulance (EAAA) in the background, as he begins his new role, at Cambridge Airport, Cambridge, in England, July 13, 2015.

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Prince William Starts His New Job

Britain's Prince William, the Duke of Cambridge sits in the cockpit as he begins his new job with the East Anglian Air Ambulance (EAAA), at Cambridge Airport, Cambridge, in England, July 13, 2015.

Stefan Rousseau/AP Photo

Prince William Starts His New Job

Britain's Prince William, the Duke of Cambridge adjusts his helmet as he prepares to board an East Anglian Air Ambulance (EAAA), to begin his new job, at Cambridge Airport, Cambridge, in England,July 13, 2015.

Stefan Rousseau/AP Photo

Prince William Receives a Sporty Gift for Princess Charlotte

Prince William, Duke of Cambridge receives an England football shirt for daughter Princess Charlotte of Cambridge from Captain Steph Houghton as he meets the England Women's Football Team at St George's Park, May 20, 2015, in Burton-upon-Trent, England.

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Prince William Receives a Sporty Gift for Princess Charlotte

Prince William, Duke of Cambridge receives an England football shirt for daughter Princess Charlotte of Cambridge as he meets the England Women's Football Team at St George's Park, May 20, 2015, in Burton-upon-Trent, England.

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Prince William Bonds With an Elephant

Prince William, Duke of Cambridge meets a rescued elephant called 'Ran Ran' at the Xishuangbanna Elephant Sanctuary, March 4, 2015, in Xishuangbanna, China.

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Prince William Rides a Bike

Prince William, Duke Of Cambridge, rides a Brompton Bicycle during his visit to the GREAT British Festival of Creativity, March 3, 2015 in Shanghai, China.

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Prince William Dresses as a Samurai Warrior

Prince William, Duke of Cambridge wears a traditional Japanese King's Costume (Samurai) during a visit to the set of a historical drama at NHK Public Broadcasting Studios on Feb. 28, 2015 in Tokyo. The Duke of Cambridge is visiting Japan from February 26th to March 1st 2015.

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Prince William, Duke of Cambridge meets NHK mascot 'Domo' during a visit to NHK Public Broadcasting Studios on the third day of his visit to Japan on Feb. 28, 2015 in Tokyo.

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Prince William Hits Tokyo

Britain's Prince William, right, waves with Tokyo Gov. Yoichi Masuzoe from a boat in Tokyo harbor after arriving in Tokyo, Feb. 26, 2015. William is on a four-day visit to Japan.

Koji Sasahara/AP Photo

Prince William Knights Daniel Day-Lewis

Sir Daniel Day-Lewis is made a Knight Bachelor of the British Empire by Prince William, the Duke of Cambridge, during an investiture ceremony at Buckingham Palace, London on Nov. 14, 2014.

Dominic Lipinski/Landov

Prince William Plays Video Games with Young People

Prince William, Duke of Cambridge plays a games console with young people as he visits the Access Centre during an official visit to Malta, Sept. 21, 2014, in Valletta, Malta.

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What's Prince William Laughing At?

Britain's Prince William and Camilla, Duchess of Cornwall, laugh during the opening ceremony of the Invictus Games at the Queen Elizabeth Park in east London, Sept. 10, 2014.

Luke MacGregor/Reuters

Prince William addresses cameras on Sept. 8, 2014, the same day that it was announced that his wife, Catherine, the Duchess of Cambridge, is pregnant with the couples' second child.

ABC News

Prince William to Become Air Ambulance Pilot

Prince William is seen at the controls of a Sea King helicopter as part of a search and rescue training exercise in Anglesey, Wales, March 31, 2011. The 32-year-old prince will join the East Anglian Air Ambulance as a pilot. Read More: <a href="http://abcn.ws/1sgYJVj" target="external">Prince William's New Job</a>

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Prince William Unveils a Statue

Britain's Prince William looks at a statute in honor of the first cartographer to circumnavigate Australia at Australia House, London, July 18, 2014.

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Prince William Lays a Wreath at the Coventry War Memorial Park

Prince William, Duke of Cambridge lays a wreath during an official visit to the Coventry War Memorial Park, July 16, 2014, in Coventry, England.

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Prince William Takes a Swim

Britain's Prince William, The Duke of Cambridge, snorkels with British Sub-Aqua Club (BSAC) members at a swimming pool in London, July 9, 2014.

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Prince William Plays Polo

Prince William Turns 32

Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince George of Cambridge leave Fairbairne Airbase as they head back to the UK after finishing their Royal Visit to Australia on April 25, 2014 in Canberra, Australia. William is celebrating his 32nd birthday Saturday, June 21, 2014.

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Why Prince William Teamed Up with David Beckham

Prince William, Duke of Cambridge and David Beckham pose together at the launch of United for Wildlife campaign at Google Town Hall on June 9, 2014 in London, England.